Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Analysis of Heat Quantity in CNG Direct Injection Bomb(1) : Homogeneous Charge

CNG 직접분사식 연소기에서의 열량해석(1) :균질급기

  • 최승환 (부산대학교 기계공학과) ;
  • 전충환 (부산대학교 기계공학부, 기계기술연구소) ;
  • 장영준 (부산대학교 기계공학부, 기계기술연구소)
  • Published : 2004.03.01
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Abstract

A cylindrical constant volume combustion bomb is used to investigate the combustion characteristics and to analyze the heat quantity of homogeneous charge methane-air mixture under various initial pressures, excess air ratios and ignition times. As the overall pressure increase, the values of maximum combustion pressure, maximum heat release rate and cumulative heat release have been increased. But it is not very meaningful to compare with some values such as maximum combustion pressure, maximum heat release rate and cumulative heat release for different overall pressure due to the different heat energy of supplied fuel. So the each value is needed to be compared with normalized value, which is divided by the entered fuel energy. To analyze the heat quantity, some definitions including the CHR ratio, the UHC ratio and the HL ratio are needed and are calculated. As the overall pressure increase, the CHR ratios and the UHC ratios have been decreased, while the HL ratios have been increased. The CHR ratio of 300 ms has the higher value than that of 10000ms, and the HL ratios of 300 ms have a lower value.

Keywords

References

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